Hindi Version: How to reach Sabarimala via train?

How to reach Sabarimala by train? Route map with audio in Hindi language. The nearest railway stations are Kottayam, Thiruvalla and Chenganur. Sabarimala, situated in Pathanamthitta district in Kerala,  is dedicated to Lord Ayyappa and its remains open during the major pilgrim periods of mandala; during the months of November and December and makaravilakku in January.